<?php

namespace GetId3\Module\Graphic;

use GetId3\Handler\BaseHandler;

/////////////////////////////////////////////////////////////////
/// GetId3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.graphic.svg.php                                      //
// module for analyzing SVG Image files                        //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

/**
 * module for analyzing SVG Image files
 *
 * @author James Heinrich <info@getid3.org>
 *
 * @link http://getid3.sourceforge.net
 * @link http://www.getid3.org
 */
class Svg extends BaseHandler
{
    /**
     * @return bool
     */
    public function analyze()
    {
        $info = &$this->getid3->info;

        fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);

        $SVGheader = fread($this->getid3->fp, 4096);
        if (preg_match('#\<\?xml([^\>]+)\?\>#i', $SVGheader, $matches)) {
            $info['svg']['xml']['raw'] = $matches;
        }
        if (preg_match('#\<\!DOCTYPE([^\>]+)\>#i', $SVGheader, $matches)) {
            $info['svg']['doctype']['raw'] = $matches;
        }
        if (preg_match('#\<svg([^\>]+)\>#i', $SVGheader, $matches)) {
            $info['svg']['svg']['raw'] = $matches;
        }
        if (isset($info['svg']['svg']['raw'])) {
            $sections_to_fix = array('xml', 'doctype', 'svg');
            foreach ($sections_to_fix as $section_to_fix) {
                if (!isset($info['svg'][$section_to_fix])) {
                    continue;
                }
                $section_data = array();
                while (preg_match('/ "([^"]+)"/', $info['svg'][$section_to_fix]['raw'][1], $matches)) {
                    $section_data[] = $matches[1];
                    $info['svg'][$section_to_fix]['raw'][1] = str_replace($matches[0], '', $info['svg'][$section_to_fix]['raw'][1]);
                }
                while (preg_match('/([^\s]+)="([^"]+)"/', $info['svg'][$section_to_fix]['raw'][1], $matches)) {
                    $section_data[] = $matches[0];
                    $info['svg'][$section_to_fix]['raw'][1] = str_replace($matches[0], '', $info['svg'][$section_to_fix]['raw'][1]);
                }
                $section_data = array_merge($section_data, preg_split('/[\s,]+/', $info['svg'][$section_to_fix]['raw'][1]));
                foreach ($section_data as $keyvaluepair) {
                    $keyvaluepair = trim($keyvaluepair);
                    if ($keyvaluepair) {
                        $keyvalueexploded = explode('=', $keyvaluepair);
                        $key = (isset($keyvalueexploded[0]) ? $keyvalueexploded[0] : '');
                        $value = (isset($keyvalueexploded[1]) ? $keyvalueexploded[1] : '');
                        $info['svg'][$section_to_fix]['sections'][$key] = trim($value, '"');
                    }
                }
            }

            $info['fileformat'] = 'svg';
            $info['video']['dataformat'] = 'svg';
            $info['video']['lossless'] = true;
            //$info['video']['bits_per_sample']    = 24;
            $info['video']['pixel_aspect_ratio'] = (float) 1;

            if (!empty($info['svg']['svg']['sections']['width'])) {
                $info['svg']['width'] = intval($info['svg']['svg']['sections']['width']);
            }
            if (!empty($info['svg']['svg']['sections']['height'])) {
                $info['svg']['height'] = intval($info['svg']['svg']['sections']['height']);
            }
            if (!empty($info['svg']['svg']['sections']['version'])) {
                $info['svg']['version'] = $info['svg']['svg']['sections']['version'];
            }
            if (!isset($info['svg']['version']) && isset($info['svg']['doctype']['sections'])) {
                foreach ($info['svg']['doctype']['sections'] as $key => $value) {
                    if (preg_match('#//W3C//DTD SVG ([0-9\.]+)//#i', $key, $matches)) {
                        $info['svg']['version'] = $matches[1];
                        break;
                    }
                }
            }

            if (!empty($info['svg']['width'])) {
                $info['video']['resolution_x'] = $info['svg']['width'];
            }
            if (!empty($info['svg']['height'])) {
                $info['video']['resolution_y'] = $info['svg']['height'];
            }

            return true;
        }
        $info['error'][] = 'Did not find expected <svg> tag';

        return false;
    }
}
